Which Bulb?

[Richer]

I'm thinking about getting this MH/PC combo pendent sometime in the future for my 30 gallon tank... my question is, which 175 watt bulb should I use? 10000k, or 12000k? Since this pendent has 2x28watt actinic pc bulbs in it, does it really matter?

I figure its probably going to be up to my own preference... but I've never run a tank with any bulb with a K rating higher than 10000k, so I don't really know what a higher K bulb will look like.

-Richer